...after this fix made in 19H1, Microsoft will soon back-ported the other fixes to the October Update.

With the CU released today in the Release Preview ring (KB4476976, build 17763.288), Microsoft (finally) has back-ported these fixes to the October Update:
Another of the bug fixes with this CU is described in this comment.

I guess this CU will reach the stable version in a few days.

EDIT: Apparently the first bug that appears in the image (The Action center may suddenly appear on the opposite side...) has not been fixed, when that bug was fixed in the build 18262, the processes of the Start menu and the Action center were separated in the task manager, I think that was the way in which Microsoft fixed that bug:

After installing this CU, I looked at the task manager and they had not separated the processes so it seems that that specific bug has not been fixed.

With the CU released today in the Release Preview ring (KB4476976, build 17763.288), Microsoft (finally) has back-ported these fixes to the October Update:
Another of the bug fixes with this CU is described in this comment.

I updated my computer to the new October 1809 update and everything went fine. Everything seemed to work just fine, but after I turned off the computer and started it up today I got this bluescreen. Windows 10 would not boot the first time, I shut...

Source: What's new for IT pros in Windows 10, version 1809 - Microsoft Tech Community - 263909
See also:
Windows 10 October 2018 Update now available - Windows 10 Forums
Find out what is new in Windows 10 October 2018 Update and Office -...

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